var pattern = {
	email: /^\S+?@\S+?\.\S+?$/,
	idcard: /^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/,
	url: new RegExp(
		'^(?!mailto:)(?:(?:http|https|ftp)://|//)(?:\\S+(?::\\S*)?@)?(?:(?:(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[0-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]+-*)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]+-*)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,})))|localhost)(?::\\d{2,5})?(?:(/|\\?|#)[^\\s]*)?$',
		'i'
	),
}

const FORMAT_MAPPING = {
	int: 'integer',
	bool: 'boolean',
	double: 'number',
	long: 'number',
	password: 'string',
	// "fileurls": 'array'
}

function formatMessage(args, resources = '') {
	var defaultMessage = ['label']
	defaultMessage.forEach((item) => {
		if (args[item] === undefined) {
			args[item] = ''
		}
	})

	let str = resources
	for (let key in args) {
		let reg = new RegExp('{' + key + '}')
		str = str.replace(reg, args[key])
	}
	return str
}

function isEmptyValue(value, type) {
	if (value === undefined || value === null) {
		return true
	}

	if (typeof value === 'string' && !value) {
		return true
	}

	if (Array.isArray(value) && !value.length) {
		return true
	}

	if (type === 'object' && !Object.keys(value).length) {
		return true
	}

	return false
}

const types = {
	integer(value) {
		return types.number(value) && parseInt(value, 10) === value
	},
	string(value) {
		return typeof value === 'string'
	},
	number(value) {
		if (isNaN(value)) {
			return false
		}
		return typeof value === 'number'
	},
	boolean: function (value) {
		return typeof value === 'boolean'
	},
	float: function (value) {
		return types.number(value) && !types.integer(value)
	},
	array(value) {
		return Array.isArray(value)
	},
	object(value) {
		return typeof value === 'object' && !types.array(value)
	},
	date(value) {
		return value instanceof Date
	},
	timestamp(value) {
		if (!this.integer(value) || Math.abs(value).toString().length > 16) {
			return false
		}
		return true
	},
	file(value) {
		return typeof value.url === 'string'
	},
	email(value) {
		return (
			typeof value === 'string' &&
			!!value.match(pattern.email) &&
			value.length < 255
		)
	},
	url(value) {
		return typeof value === 'string' && !!value.match(pattern.url)
	},
	pattern(reg, value) {
		try {
			return new RegExp(reg).test(value)
		} catch (e) {
			return false
		}
	},
	method(value) {
		return typeof value === 'function'
	},
	idcard(value) {
		return typeof value === 'string' && !!value.match(pattern.idcard)
	},
	'url-https'(value) {
		return this.url(value) && value.startsWith('https://')
	},
	'url-scheme'(value) {
		return value.startsWith('://')
	},
	'url-web'(value) {
		return false
	},
}

class RuleValidator {
	constructor(message) {
		this._message = message
	}

	async validateRule(fieldKey, fieldValue, value, data, allData) {
		var result = null

		let rules = fieldValue.rules

		let hasRequired = rules.findIndex((item) => {
			return item.required
		})
		if (hasRequired < 0) {
			if (value === null || value === undefined) {
				return result
			}
			if (typeof value === 'string' && !value.length) {
				return result
			}
		}

		var message = this._message

		if (rules === undefined) {
			return message['default']
		}

		for (var i = 0; i < rules.length; i++) {
			let rule = rules[i]
			let vt = this._getValidateType(rule)

			Object.assign(rule, {
				label: fieldValue.label || `["${fieldKey}"]`,
			})

			if (RuleValidatorHelper[vt]) {
				result = RuleValidatorHelper[vt](rule, value, message)
				if (result != null) {
					break
				}
			}

			if (rule.validateExpr) {
				let now = Date.now()
				let resultExpr = rule.validateExpr(value, allData, now)
				if (resultExpr === false) {
					result = this._getMessage(
						rule,
						rule.errorMessage || this._message['default']
					)
					break
				}
			}

			if (rule.validateFunction) {
				result = await this.validateFunction(
					rule,
					value,
					data,
					allData,
					vt
				)
				if (result !== null) {
					break
				}
			}
		}

		if (result !== null) {
			result = message.TAG + result
		}

		return result
	}

	async validateFunction(rule, value, data, allData, vt) {
		let result = null
		try {
			let callbackMessage = null
			const res = await rule.validateFunction(
				rule,
				value,
				allData || data,
				(message) => {
					callbackMessage = message
				}
			)
			if (
				callbackMessage ||
				(typeof res === 'string' && res) ||
				res === false
			) {
				result = this._getMessage(rule, callbackMessage || res, vt)
			}
		} catch (e) {
			result = this._getMessage(rule, e.message, vt)
		}
		return result
	}

	_getMessage(rule, message, vt) {
		return formatMessage(
			rule,
			message ||
				rule.errorMessage ||
				this._message[vt] ||
				message['default']
		)
	}

	_getValidateType(rule) {
		var result = ''
		if (rule.required) {
			result = 'required'
		} else if (rule.format) {
			result = 'format'
		} else if (rule.arrayType) {
			result = 'arrayTypeFormat'
		} else if (rule.range) {
			result = 'range'
		} else if (rule.maximum !== undefined || rule.minimum !== undefined) {
			result = 'rangeNumber'
		} else if (
			rule.maxLength !== undefined ||
			rule.minLength !== undefined
		) {
			result = 'rangeLength'
		} else if (rule.pattern) {
			result = 'pattern'
		} else if (rule.validateFunction) {
			result = 'validateFunction'
		}
		return result
	}
}

const RuleValidatorHelper = {
	required(rule, value, message) {
		if (rule.required && isEmptyValue(value, rule.format || typeof value)) {
			return formatMessage(rule, rule.errorMessage || message.required)
		}

		return null
	},

	range(rule, value, message) {
		const { range, errorMessage } = rule

		let list = new Array(range.length)
		for (let i = 0; i < range.length; i++) {
			const item = range[i]
			if (types.object(item) && item.value !== undefined) {
				list[i] = item.value
			} else {
				list[i] = item
			}
		}

		let result = false
		if (Array.isArray(value)) {
			result = new Set(value.concat(list)).size === list.length
		} else {
			if (list.indexOf(value) > -1) {
				result = true
			}
		}

		if (!result) {
			return formatMessage(rule, errorMessage || message['enum'])
		}

		return null
	},

	rangeNumber(rule, value, message) {
		if (!types.number(value)) {
			return formatMessage(
				rule,
				rule.errorMessage || message.pattern.mismatch
			)
		}

		let { minimum, maximum, exclusiveMinimum, exclusiveMaximum } = rule
		let min = exclusiveMinimum ? value <= minimum : value < minimum
		let max = exclusiveMaximum ? value >= maximum : value > maximum

		if (minimum !== undefined && min) {
			return formatMessage(
				rule,
				rule.errorMessage ||
					message['number'][
						exclusiveMinimum ? 'exclusiveMinimum' : 'minimum'
					]
			)
		} else if (maximum !== undefined && max) {
			return formatMessage(
				rule,
				rule.errorMessage ||
					message['number'][
						exclusiveMaximum ? 'exclusiveMaximum' : 'maximum'
					]
			)
		} else if (
			minimum !== undefined &&
			maximum !== undefined &&
			(min || max)
		) {
			return formatMessage(
				rule,
				rule.errorMessage || message['number'].range
			)
		}

		return null
	},

	rangeLength(rule, value, message) {
		if (!types.string(value) && !types.array(value)) {
			return formatMessage(
				rule,
				rule.errorMessage || message.pattern.mismatch
			)
		}

		let min = rule.minLength
		let max = rule.maxLength
		let val = value.length

		if (min !== undefined && val < min) {
			return formatMessage(
				rule,
				rule.errorMessage || message['length'].minLength
			)
		} else if (max !== undefined && val > max) {
			return formatMessage(
				rule,
				rule.errorMessage || message['length'].maxLength
			)
		} else if (
			min !== undefined &&
			max !== undefined &&
			(val < min || val > max)
		) {
			return formatMessage(
				rule,
				rule.errorMessage || message['length'].range
			)
		}

		return null
	},

	pattern(rule, value, message) {
		if (!types['pattern'](rule.pattern, value)) {
			return formatMessage(
				rule,
				rule.errorMessage || message.pattern.mismatch
			)
		}

		return null
	},

	format(rule, value, message) {
		var customTypes = Object.keys(types)
		var format = FORMAT_MAPPING[rule.format]
			? FORMAT_MAPPING[rule.format]
			: rule.format || rule.arrayType

		if (customTypes.indexOf(format) > -1) {
			if (!types[format](value)) {
				return formatMessage(
					rule,
					rule.errorMessage || message.typeError
				)
			}
		}

		return null
	},

	arrayTypeFormat(rule, value, message) {
		if (!Array.isArray(value)) {
			return formatMessage(rule, rule.errorMessage || message.typeError)
		}

		for (let i = 0; i < value.length; i++) {
			const element = value[i]
			let formatResult = this.format(rule, element, message)
			if (formatResult !== null) {
				return formatResult
			}
		}

		return null
	},
}

class SchemaValidator extends RuleValidator {
	constructor(schema, options) {
		super(SchemaValidator.message)

		this._schema = schema
		this._options = options || null
	}

	updateSchema(schema) {
		this._schema = schema
	}

	async validate(data, allData) {
		let result = this._checkFieldInSchema(data)
		if (!result) {
			result = await this.invokeValidate(data, false, allData)
		}
		return result.length ? result[0] : null
	}

	async validateAll(data, allData) {
		let result = this._checkFieldInSchema(data)
		if (!result) {
			result = await this.invokeValidate(data, true, allData)
		}
		return result
	}

	async validateUpdate(data, allData) {
		let result = this._checkFieldInSchema(data)
		if (!result) {
			result = await this.invokeValidateUpdate(data, false, allData)
		}
		return result.length ? result[0] : null
	}

	async invokeValidate(data, all, allData) {
		let result = []
		let schema = this._schema
		for (let key in schema) {
			let value = schema[key]
			let errorMessage = await this.validateRule(
				key,
				value,
				data[key],
				data,
				allData
			)
			if (errorMessage != null) {
				result.push({
					key,
					errorMessage,
				})
				if (!all) break
			}
		}
		return result
	}

	async invokeValidateUpdate(data, all, allData) {
		let result = []
		for (let key in data) {
			let errorMessage = await this.validateRule(
				key,
				this._schema[key],
				data[key],
				data,
				allData
			)
			if (errorMessage != null) {
				result.push({
					key,
					errorMessage,
				})
				if (!all) break
			}
		}
		return result
	}

	_checkFieldInSchema(data) {
		var keys = Object.keys(data)
		var keys2 = Object.keys(this._schema)
		if (new Set(keys.concat(keys2)).size === keys2.length) {
			return ''
		}

		var noExistFields = keys.filter((key) => {
			return keys2.indexOf(key) < 0
		})
		var errorMessage = formatMessage(
			{
				field: JSON.stringify(noExistFields),
			},
			SchemaValidator.message.TAG +
				SchemaValidator.message['defaultInvalid']
		)
		return [
			{
				key: 'invalid',
				errorMessage,
			},
		]
	}
}

function Message() {
	return {
		TAG: '',
		default: '验证错误',
		defaultInvalid: '提交的字段{field}在数据库中并不存在',
		validateFunction: '验证无效',
		required: '{label}必填',
		enum: '{label}超出范围',
		timestamp: '{label}格式无效',
		whitespace: '{label}不能为空',
		typeError: '{label}类型无效',
		date: {
			format: '{label}日期{value}格式无效',
			parse: '{label}日期无法解析,{value}无效',
			invalid: '{label}日期{value}无效',
		},
		length: {
			minLength: '{label}长度不能少于{minLength}',
			maxLength: '{label}长度不能超过{maxLength}',
			range: '{label}必须介于{minLength}和{maxLength}之间',
		},
		number: {
			minimum: '{label}不能小于{minimum}',
			maximum: '{label}不能大于{maximum}',
			exclusiveMinimum: '{label}不能小于等于{minimum}',
			exclusiveMaximum: '{label}不能大于等于{maximum}',
			range: '{label}必须介于{minimum}and{maximum}之间',
		},
		pattern: {
			mismatch: '{label}格式不匹配',
		},
	}
}

SchemaValidator.message = new Message()

export default SchemaValidator
